Ventilator

ABSTRACT

A ventilator is provided for the supply of untreated exterior air to a room. The ventilator has a valve seat (1), a valve body (2), means for connecting the ventilator to an exterior air duct (4) and operating means (6, 7) for resetting the position of the valve body. Stationary support elements (8) carry the valve body via a coupling (9) of the kind which, on repeated operating impulses from the operating means (6, 7) alternatingly takes the valve body to an outer position and returns it to an inner position. Both these positions are so selected that the inner one corresponds to the minimum demand for ventilation of an empty room while the outer one corresponds to the demand for ventillation with projected use by persons of the room.

DESCRIPTION

1. Technical Field

The invention relates to a ventilator which is adapted for the supply ofuntreated exterior air to a room, and comprises a valve seat with avalve body setable thereto, means for connecting the ventilator to anexterior air duct, means for resetting the valve body and locking meansfor retaining the valve body in a set position.

2. Background Art

A large number of different ventilators are known for the supply ofuntreated exterior air to a room, e.g. flap valves and disc valves in anoutside wall, and slit valves in, or under the window structure. Allhave the following disadvantages to a greater or less degree. They areoptionally adjustable in different opening positions and can therefore,inter alia by unsuitable setting, give rise to draughts or the opposite,i.e., insufficient ventilation. If they are permanently open, or openedtoo much in relation to the ventilation need, they result inconsiderable energy losses for heating the supplied exterior air duringthe cold season.

DISCLOSURE OF INVENTION

The object of the invention is to provide, for the purpose of savingenergy and improving environment, a ventilator of the kind disclosed inthe introduction, and which is well-suited for equipping with an airfilter and sound insulation, and which is easily settable betweendistinct minimum and maximum positions, said positions not beingdisturbed on resetting or cleaning, and which furthermore is well-suitedfor operation automatically with low power consumption.

The intended result is obtained by the ventilator being given thecharacterizing features apparent from the following patent claim 1.

BRIEF DESCRIPTION OF DRAWINGS

An embodiment of the invention will now be described while referring tothe appended drawings.

FIG. 1 is a section through the valve body and valve seat of theventilator in the room and through its members closest to it in anexterior air duct.

FIG. 2 is a section through a mechanical coupling according to II--II inFIG. 1.

FIG. 3 is a partial section to a larger scale of an end portion of themechanical coupling in FIG. 1.

FIG. 4 illustrates to the same enlarged scale a coupling member in themechanical coupling according to FIG. 3, seen from one side.

FIG. 5 is an end view to the enlarged scale of the coupling memberaccording to FIG. 4.

FIG. 6 is a side view in the enlarged scale of an axially displaceablemounting means for the coupling member in the mechanical couplingaccording to FIGS. 1-5.

FIG. 7 is a side view to the enlarged scale of the mounting memberaccording to FIG. 6.

FIG. 8 is a cross section to the enlarged scale according to VIII--VIIIin FIG. 1.

FIG. 9 is a development along IX--IX in FIG. 8, illustrating to thelarger scale a crenelated profile on a coupling engagement detailco-acting with the coupling member.

FIG. 10 is a section to the larger scale according to X--X in FIG. 1,through a device for adjusting the maximum opening of the valve body.

FIG. 11 is a side view to the enlarged scale of a device for releasingthe valve body for cleaning.

FIG. 12 is an end view of the device according to FIG. 11, and to thesame scale as FIG. 11.

MODE FOR CARRYING OUT THE INVENTION

The ventilator is adapted for supply of untreated exterior air to aroom. The ventilator has a valve seat 1 and a valve body 2 in the formof a disc settable in relation to the valve seat. Means are arranged inthe connection with the valve seat for connecting the ventilator to anexterior air duct 4 through the outer wall 5, and is illustrated in FIG.1 solely by a pipe stub 3, which shall be assumed to be provided withconventional attaching means for installing in the outer wall 5.

In the shown embodiment, the valve has alternative operating means 6 and7 for resetting the valve body 2 in relation to the valve seat 1.

By a coupling 9 the valve body 2 is carried by stationary support means8, in the form of two flat carrying arms which are oriented with theirgreatest cross-sectional dimension in the flow direction of the air.

The coupling 9 is of the kind, which, on repeated operating impulsesfrom either operating means 6, 7, alternately takes the valve body outto an outer position and returns it to an inner position. Both thesepositions are predetermined by adjustment to correspond to the maximumdemand for ventilation,--for a projected use by persons of theroom,--and the minimum demand for ventilation, i.e. for an empty room.In the latter case, the valve can generally be assumed to be completelyclosed.

In other words, the coupling is of the kind known per se from ball pointpens, which are adapted to give the tube of writing medium a projectedand a retracted position. In its new field of use, the coupling inaccordance with FIG. 1 has a spindle 10 carrying the valve body 2 at itsouter end. The spindle is axially movably mounted in a hub sleeve 11concentric with the pipe stub 3, said sleeve 11 being carried by botharms 8. The spindle is prevented from turning in the sleeve by itshaving two projections 12, each running in a longitudinal groove 13 inthe sleeve. The inner end of the spindle has a pin 14 thrusting into anend sleeve 15, which is rotatable on the end pin and has four radiallyoutwardly projecting teeth 16 at its end facing towards the valve body(see FIGS. 3-5). The end sleeve 15 is in turn placed in a sleeve-shapedbearing means 17, the end of which facing away from the valve bodyprojects out from the hub sleeve 11, and the opposite end of which hasfour radially projecting guide lugs 18 (see FIGS. 6 and 7). The hubsleeve 11 has end stops outside these lugs preventing the bearing means17 from falling out of the sleeve. The lugs 18 on the bearing means 17,like to the teeth 16 on the end sleeve 15, run in longitudinal grooves19 on the inside of the hub sleeve 11, within an area of the inner endof the sleeve having greater wall thickness than the rest of the sleeve,as a result of less inner diameter. The end of the bearing means facingtowards the valve body has a toothed crowns 22 with axially projectingteeth.

The material portions situated between the four grooves 19 in the hubsleeve 11 are terminated in a direction towards the valve body 2 by acrennelation having a saw-toothed profile in the circumferencialdirection, as is apparent from the development in FIG. 9. The sawteeth20 and 21 have a sloping plane conforming to the slope of the teeth 16on the end surfaces facing away from the valve body. A tooth 16 is shownin FIG. 9 in three positions denoted A, B and C.

If the valve body 2 is in the position illustrated in FIG. 1 for aclosed valve, each tooth 16 is situated in a groove 19, as indicated byposition A in FIG. 9. The end sleeve 15 and the bearing means 17 do notneed for that reason to have taken up their absolute end positions, butin response to the adjustment of the spindle 10 in relation to the valvebody they can have a greater or less axial play in the hub sleeve 11. Ifeither of the operating means 6, 7 gives the bearing means 17 an axialmovement by sending an operating impulse, the crown 22 of the bearingmeans 17 urges the end sleeve 15 in the same direction. Axially, thebearing means and end sleeve engage against each other solely via thecrown 22 and the sloping surfaces of the teeth 16. When the end sleeve15, and thereby the spindle 10 and valve body 2 also, are moved outwardsof the space so far that the teeth 16 have passed the ends of thegrooves 19, the teeth 16, resting on the tooth tops of the crown 22,glide off the teeth of the crown and into the sloping surfaces of thesawteeth 20, as a result of a force opposing the operating impulse, thisforce being provided by a compression spring 23 and are taken further bythe same force to the base of the sawteeth, position B in FIG. 9, whenthe bearing means 17 returns after the operating impulse has ceased.

From such a forward-thrust position in accordance with B in FIG. 9, inwhich the teeth 16 are retained by the mentioned spring force andlatching action from an adjacent tooth 21, the end sleeve 15 is movedaway by the subsequent operating impulse, the crown 22 of the bearingmeans 17 once again engaging the sloping surface of the tooth 16(position B) and pushes the sleeve 15 so far that the tooth 16 can passthe sawtooth 21 and be taken by the sloping surface of the latter intothe adjacent groove 19 and be taken by the spring force to the positionC, when the bearing means 17 once again returns when the operatingimpulse has ceased.

The bearing means 17, end sleeve 15 and spindle 10 with the spring 23are inserted into the hub sleeve 11 on assembly from the right-hand endthereof in FIG. 1, subsequent to which an end piece 24 guiding thespindle is mounted on the hub sleeve 11, the exterior tongues 25extending along the outside of the hub sleeve. Two snap-on clips 26retain the end piece 24 in place, as is apparent from FIG. 2 (thesnap-on clips 26 are somewhat improperly indicated in FIG. 1 also).

The primary operating means 6 comprises an electromagnetic linear motorsituated behind the coupling 9, which motor is supplied with current inimpulses, and the working piston 27 of which executes a stroke to theright in FIG. 1 and thereby thrusts the bearing means 17 to the right sothat the coupling 9 carries out a change of the valve body position, ashas been described above. The piston can have a built-in (not shown)return spring or can be returned by the coupling spring 23.

The linear motor 6 is also carried by support means 48 in the form offlat carrying arms oriented with their greatest cross-sectionaldimension in the flow direction of the air, and they are united by ahub-like sleeve concentric with the pipe stub 3 and surrounding themotor.

The secondary operating means 7 comprises a coupling driving dog elementin the form of a blade 28 glidably arranged in guides (not shown) in aplane along one of the carrying arms 8, and is formed with a boss 29,extending in between the head of the piston 27 and the back end of thebearing means 17 in the coupling 9. The coupling driving dog element 28is movable to the right by means of a cord, chain 30 or similar, formanually changing the position of the valve body 2 by actuating thebearing means 17.

For impulse current supply to the electromagnet of the linear motor 6, atime relay is suitably disposed for closing a supply circuit at regularintervals. The same time relay is thereby preferably adapted for servingseveral ventilators of the kind described, e.g. all the air ventilatorsin a house or living apartment. Each linear motor 6 is thereby adaptedswichable between several optional changing cycles for the operatingimpulse, e.g. three cycles, one for setting the ventilator open duringthe day (for a room with general activity and the like), one for settingthe ventilator open at night (for bedrooms) and one which sets the valveopen during the eventing (for hoppy rooms and the like).

Suitable switching means can be placed more or less easily available,depending on what flexibility of the system is desirable or advisable.

The current supply circuit is suitably arranged for low voltage.

For setting the maximum opening position of the valve body 2 the spindle10 is provided at its outer end with an externally threaded attachmentsleeve 32 for the valve body (see FIGS. 1 and 10-12) with the aid of abayonette-type coupling 31. A sliding sleeve 33 is slidably mounted onthe attachment sleeve 32 and is made integral with the back portion ofthe valve body. A pressure spring 34 is biased to move the slidingsleeve outwards from the attachment sleeve. A nut 35 is threaded on tothe attachment sleeve outside the back portion of the valve body, toprevent movement of the valve body outwards from the attachment sleeve.The nut 35 is accessible for adjustment of the maximum opening afterremoving the front portion 36 of the valve body together with a soundand heat insulating piece of porous material placed between the frontportion and the back portion. The attachment sleeve 32 is provided withgrooves 37 to prevent movement of the sleeve 33 on the sleeve 32, thegrooves co-acting with projections (not shown) on the sleeve 33.

For rapid release of the valve body 2 without risk of altering thesetting, the valve body is pressed inwards, when it is in its openposition, and is truned for releasing the bayonette coupling 31,whereafter it can be pulled free from the fastening sleeve 32. Anannular air filter 38 is thus also exposed, this filter surrounding thesliding sleeve 33 and by means of snap-on projections 39 is attached tothe expanded forward end of the pipe stub 3. In reassembled condition,the bayonette coupling is kept in place by a compression spring 40between the end of the spindle 10 and the bottom of the attachmentsleeve 32.

The illustrated and described ventilator is suitably connected, for thepassage of the exterior air through the outer wall 5, to a pipe stub 41(FIG. 1), thrusting into a combined weather and noise protector (notshown) on the outside of the outer wall. The air filter 38 and theinsulation material in the valve body 2 provide a very effectiveinsulation against noise, cold and condensation.

Apart from the embodiment shown, the ventilator can be used withoperation solely by the electromagnetic linear motor or solely by themanual operating means. Even in the latter embodiment, it is veryadvantageous due to its easy operation and the distinct settingpositions afforded, not least in installations adapted for thehandicapped.

What is claimed as new and desired to be secured by Letters Patent ofthe United States is:
 1. A ventilator for the supply of outside air to aroom, comprising:a valve seat fixed relative to said ventilator; a valvebody movable relative to said seat in an axial direction between an openposition and a closed position; means connecting said ventilator to anair duct for supplying air to an opening defined by said valve body andvalve seat when said valve body is in said open position; operatingmeans for moving said valve body between said open and closed positions;and latching means for maintaining said valve body in said open andclosed positions, said latching means further comprising:(a) a tubularsleeve fixed relative to said valve seat and extending in said axialdirection, (b) at least two axial grooves in said tubular sleeve, thecircumferential portions between said grooves at a first end of saidtubular sleeve being formed as a pair of circumferentially spaced slantsurfaces sloped in the same direction and connected by an axial surface,said first end of said sleeve facing said valve body, (c) bearing meanspositioned in said sleeve, said bearing means including guide lugs ineach of said grooves for guiding said bearing means along an axial pathin said sleeve, said bearing means having a first end engageable withsaid operating means for moving said bearing means along said path in afirst directional sense, said bearing means having a second end facingsaid valve body, said second end having a circumferential array ofalternately oppositely sloped slant surfaces forming alternate peaks andtroughs, one of said peaks being circumferentially positioned at eachsaid guide lug, whereby one said peak is movable in each said groove,(d) an end sleeve positioned in said tubular sleeve and fixed to saidvalve body, said end sleeve including teeth positionable in each of saidgrooves between said guide lugs and said first end of said tubularsleeve, each of said teeth having a first end opposite said valve body,said first end including a circumferentially slanted surface sloped inthe same direction as said slant surfaces of said first end of saidtubular sleeve, and (e) means for biasing said end sleeve in a seconddirectional sense opposite said first directional sense and away fromsaid valve body.
 2. The ventilator of claim 1 wherein said operatingmeans comprises an electromagnetic linear motor actuated by currentimpulses.
 3. The ventilator of claim 2 wherein said motor is positionedin said air duct.
 4. The ventilator of claim 2 wherein said operatingmeans includes a manual actuator independent of said motor.
 5. Theventilator of claim 1 wherein said means for biasing comprises a singlespring having one end connected to an element fixed to said valve seatand a second end connected to said end sleeve.
 6. Ventilator as claimedin claim 2 including a time relay adapted for initiating said impulseson the basis of expected, regularly occurring times for alteration ofthe ventilation load on the room caused by the presence of persons. 7.Ventilator as claimed in claim 6 wherein said time relay is adapted forserving several ventilators of the same kind, and that theelectromagnetic linear motor of each said ventilator is electricallyswitchable between several optional changing cycles for said operatingimpulses.